On Sunday 23 May 2010 the News of the World published what it described as "Cash for Royal Access Sensation". In a story by its "investigations editor", Mazher Mahmood (the so-called "fake sheikh"), it reported that the Duchess of York was "shamelessly plotting to sell access to her trade envoy ex-hubby Prince Andrew for £500,000″. The paper had video footage of the Duchess taking money. She had been the victim of a classic "sting", with a reporter posing as a "rich businessman" who was seeking access to her former husband, Prince Andrew, and paid US$40,000 down-payment in cash.The News of the World story has been reported by the media all round the world and has led to almost universal condemnation of the Duchess. The Daily Mail headline is not atypical: "Greedy and needy, the Duchess has blown any chance of future happiness for a fistful of dollars". The Duchess issued a statement (reproduced in the Daily Telegraph) in which she said

"I very deeply regret the situation and the embarrassment caused.

It is true that my financial situation is under stress however, that is no excuse for a serious lapse in judgment and I am very sorry that this has happened".

But was this News of the World publication justified in law? There can be no doubt that the Duchess had a reasonable expectation of privacy in relation to the conversation she had with the "businessman". The publication of the video and of the Duchess' conversations with the undercover journalist clearly engaged her Article 8 rights to respect for private life and needed justification. In the older terminology, the newspaper need to show some "public interest" to justify the publication. What is the public interest in this case?

Most people's instinct would clearly favour the existence of a public interest in this case, but what exactly is the public interest involved? The News of the World's royal editor is quoted as saying

"What is very serious here is that she's so desperate that she's prepared to jeopardise the reputation of her ex-husband and of the country, and of an important international ambassadorial role, which is, after all, funded in terms of the expenses by the taxpayer"

So, the public interest is the "exposure of desperation" – not entirely promising – or the exposure of the fact that she was prepared to risk Prince Andrew's reputation. The difficulty with this is that the News of the World does not suggest that Prince Andrew was going to do anything improper – so where is the risk?

The issue is discussed on Roy Greenslade's blog under the headline "Why the News of the World was right to expose the Duchess of York". He sets out three reasons why he is supportive of the publication of the story and the methods used to obtain it. The first is that this was not a "fishing expedition" – "that the Duchess was "already cashing in on unknowing Andrew by setting up deals with foreign businessmen". Secondly, he says that

"though I suspect from the video that the Duchess might have drunk more than was good for her, she did convict herself several times over without much obvious prompting".

These are both good points but neither directly relevant to the issue of public interest. On this issue Mr Greenslade says this

"because, despite being divorced from the Prince, they remain close friends (well, until yesterday) and her continuing close proximity to him and his family places an extra onus on her to be squeaky clean.

Similarly, there is a pressure on him, especially given his somewhat mysterious globe-trotting quasi-governmental role, not to be involved with a loose cannon"

This is not straightforward. How can proximity to the Royal family place someone under a general obligation to be "squeaky clean"? There may be a public expectation that the former wives of members of the Royal Family do not offer to sell access to them but is there a duty on the former wives to live up to that expectation? Isn't it generally known that the Duchess of York has taken full advantage of the fact that she was formerly married to Prince Andrew? Mr Greenslade recognises the difficulty

"I accept that the Duchess has made a career of trading on her royal connections and, in a sense, this is merely another, if extreme, example of her undignified willingness to do almost anything to make money.

But this kind of sordid hole-in-the-corner activity is very different from entertaining American audiences with harmless tales of visits to Buck House".

The public interest can't really be "the exposing of hypocrisy" because, as far as we are aware, the Duchess of York has never publicly declared that she will not take money for access. There is no "exposing of wrongdoing by public officials" because the Duchess of York is not one and anyway, no actual "wrongdoing" is alleged.

Nevertheless, it seems to us that there is a proper justification for the publication of the story. What the Duchess was offering was "access to a public official", for a payment which appears to be wholly disproportionate to the "monetary value" of the service offered. The size of the sum can only be explained by an assumption that the businessman was going to get something of great value – something which, as a matter of obvious inference, could not be obtained by approaching Prince Andrew through proper channels. The fact that neither the Duchess nor the businessman had any specific wrongdoing in mind does not matter. The whole transaction was "tainted" and its exposure was, we suggest, justified for that reason.

However, although there was a legitimate public interest in publication, it is clear that the News of The World did not notify the Duchess in advance of the publication. It is unclear to us why the News Of The World did not notify her in advance, especially since it appears to be the position of the media from their submissions to ECHR in the Mosley application that pre-notification is the norm.

As a footnote, we note that there is also an "ethics of journalism" issue which concerns the American media. The Washington Post reported the point in this way (without comment – and note the inverted commas)

"As for the ethics of a journalist impersonating a businessman, [the News of the World spokesman] said that there was "a legitimate public interest" in the story and that this is "common practice" in the United Kingdom"